Truth Table Calculator

Category: Algebra and General
- August 27, 2025
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Generate and analyse truth tables for logical expressions. This calculator supports standard logical operators and can handle complex Boolean expressions.

Expression Input

Use standard logical operators: && (AND), || (OR), ! (NOT), -> (IMPLIES), <-> (BICONDITIONAL)
Example Expressions:

Options

Display the evaluation of each subexpression

Understanding Truth Tables

Truth tables are used in mathematical logic to determine the output of compound logical statements for all possible combinations of input values.

Basic Logical Operators
  • AND (&&): True only when both operands are true
  • OR (||): True when at least one operand is true
  • NOT (!): Inverts the truth value of its operand
  • IMPLIES (->): False only when the first operand is true and the second is false
  • BICONDITIONAL (<->): True when both operands have the same truth value
Order of Operations
  1. Parentheses: Expressions inside parentheses are evaluated first
  2. NOT (!): Negations are evaluated next
  3. AND (&&): Conjunctions are evaluated after negations
  4. OR (||): Disjunctions are evaluated after conjunctions
  5. IMPLIES (->) and BICONDITIONAL (<->): Evaluated last
Canonical Forms
  • Disjunctive Normal Form (DNF): A disjunction (OR) of conjunctions (AND)
  • Conjunctive Normal Form (CNF): A conjunction (AND) of disjunctions (OR)
  • These forms can be derived from the truth table and provide standardised ways to express logical formulas

Disclaimer: This calculator is designed for educational purposes and supports expressions of moderate complexity. For very complex expressions with many variables, performance may be affected.

What Is the Truth Table Calculator?

The Truth Table Calculator is an interactive tool for analysing logical statements by evaluating all possible combinations of input values. It is especially useful for understanding how compound logical expressions behave under different conditions. This type of calculator is often used in fields like computer Science, digital electronics, mathematics, and logic.

Whether you're a student learning about logical operators or someone needing to validate logical conditions, this tool provides a visual and practical way to explore Boolean logic.

Key Features

  • Accepts a wide range of logical operators: && (AND), || (OR), ! (NOT), -> (IMPLIES), and <-> (BICONDITIONAL)
  • Supports step-by-step evaluation of sub-expressions
  • Generates canonical forms: Disjunctive Normal Form (DNF) and Conjunctive Normal Form (CNF)
  • Customisable output format: True/False, 1/0, or your own symbols
  • Includes variable Auto-detection or manual entry
  • Provides an expression analysis summary
  • Copy or export the resulting table to CSV

Formula Reference

Logical Operators:

  • AND (A ∧ B): True if both A and B are true
  • OR (A ∨ B): True if at least one of A or B is true
  • NOT (!A): True if A is false
  • IMPLIES (A → B): False only if A is true and B is false
  • BICONDITIONAL (A ↔ B): True if A and B are both true or both false

How to Use the Calculator

Follow these steps to generate and analyse a truth table:

  • Step 1: Enter your logical expression in the input box. For example: (A || B) && !C
  • Step 2: Choose your desired output format: T/F, 1/0, or Custom Symbols
  • Step 3: Decide whether to auto-detect variables or specify them manually
  • Step 4: Enable "Show Intermediate Steps" if you want to view sub-expression evaluations
  • Step 5: Click Generate Truth Table to produce the results
  • Step 6: Review the truth table, analysis summary, and canonical forms
  • Step 7: Use the "Copy Table" or "Export CSV" buttons if needed

Why This Tool Is Useful

Truth tables are foundational in logical reasoning, circuit design, and programming. This calculator removes the guesswork and manual effort required to generate complete tables, saving time and reducing errors. It acts similarly to tools like the matrix solver, Scientific Calculator, or fraction simplifier by breaking down abstract problems into clear, tabulated data.

By using this calculator, you can:

  • Confirm the validity of logical statements
  • Explore how logical structures behave
  • Convert expressions to standardised forms like DNF and CNF
  • Understand whether a logic formula is always true, always false, or varies (tautology, contradiction, or contingency)

Frequently Asked Questions (FAQ)

Can I use custom symbols for True and False?

Yes, choose the "Custom Symbols" option in the display format and enter your preferred symbols for true and false values.

What happens if I don’t enter variables manually?

If auto-detect is enabled, the calculator will extract variables from your expression. Otherwise, you must specify them yourself.

Is there a limit to how many variables I can use?

The calculator supports multiple variables, but very large expressions with many variables may affect performance. For advanced usage, consider using tools like a matrix computation tool or scientific functions suite.

What are DNF and CNF?

DNF (Disjunctive Normal Form) and CNF (Conjunctive Normal Form) are standardised ways to express logical formulas. They help simplify and analyse logic structures, similar to how a percent error formula or logarithm function standardises calculations.

How can this calculator support Other Math concepts?

This logic calculator complements tools like the Percent Error Calculator, exponent solver, and Rounding Calculator by helping students and professionals handle logical reasoning alongside numerical analysis.

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